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30 lines
654 B
30 lines
654 B
package merkle
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import (
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"github.com/tendermint/tendermint/crypto/tmhash"
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)
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// TODO: make these have a large predefined capacity
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var (
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leafPrefix = []byte{0}
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innerPrefix = []byte{1}
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)
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// returns tmhash(<empty>)
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func emptyHash() []byte {
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return tmhash.Sum([]byte{})
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}
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// returns tmhash(0x00 || leaf)
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func leafHash(leaf []byte) []byte {
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return tmhash.Sum(append(leafPrefix, leaf...))
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}
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// returns tmhash(0x01 || left || right)
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func innerHash(left []byte, right []byte) []byte {
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data := make([]byte, len(innerPrefix)+len(left)+len(right))
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n := copy(data, innerPrefix)
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n += copy(data[n:], left)
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copy(data[n:], right)
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return tmhash.Sum(data)
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}
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